
//导入包
const mongoose = require('mongoose');

mongoose.connect('mongodb://127.0.0.1:27017/mySon');

//建议用once连接数据库 once 只链接一次
mongoose.connection.once('open',() => {
    console.log('连接成功');
});
mongoose.connection.on('close',() => {
    console.log('连接关闭');
});
mongoose.connection.on('error',() => {
    console.log('连接失败');
});



setTimeout(() => {
    mongoose.disconnect();
},2000)
